Nope. I've tried, totally screws me up. If I'm tired then I read or listen to music for a bit. But I never actually nap, unless I'm sick...
only when i' m at work
If I'm going on a longish journey I tend to nod off in the car if someone else is driving.
I always sleep in cars. Ever since I was a baby we always went on long car rides into Europe, I only stopped going when I was 16 or so so I've built up a little technique to make the journey shorter - if I lie back and put my knees up against the seat in front so they're about level with my head then I'll drop off to sleep in about 10-15 minutes. Sleep for hours doing that. YMMV
too bad i learned that too good and always doze away in public buses and miss my station
I tend not to nap because it takes me ages to get to sleep anyway. Just occasionally, if I've had a really bad night or two I'll inadvertently nod off for a while and then feel better.
If I'm going on a longish journey I tend to nod off in the car if someone else is driving.
Still doesn't stop me from waking up silly early.